Seamless pump with coaxial magnetic coupling including stator and rotor

Abstract

A seamless pump is disclosed which includes a pump casing that houses a stator and a rotor. The stator and rotor provide enhanced pumping action in the seamless pump. The stator surrounds at least a portion of the rotor. A rotatable housing surrounds at least a portion of the pump casing and is operatively connected to the motor. A plurality of first magnets are located about an interior surface of the housing and are rotatable therewithin and a plurality of second magnets are operatively connected to and rotatable with the impeller. A seal isolates the second magnets from material being pumped by the pump. A cooling jacket may be used to cool the pump.

I claim: 
     
       1. A pump comprising: a motor;   a pump casing that houses a stator and a rotor assembly, wherein the rotor assembly surrounds at least a portion of the stator;   a rotatable housing surrounding at least a portion of the pump casing and operatively connected to the motor;   a first magnet located about an interior surface of the rotatable housing and rotatable therewithin; and   a second magnet operatively connected to and rotatable with the rotor assembly.   
     
     
       2. The pump of claim 1, wherein the rotatable housing has an inner surface and an outer surface, said inner surface including a bearing thereon. 
     
     
       3. The pump of claim 1, wherein the stator includes an inner surface that is an undulated progressive cavity. 
     
     
       4. The pump of claim 1, wherein the rotor assembly includes a rotor coupled to an auger impeller housing and a rotatable member coupled to the auger impeller housing. 
     
     
       5. The pump of claim 4, wherein the rotor assembly has a bearing thereon functioning to support the rotor assembly within the pump casing. 
     
     
       6. The pump of claim 4, wherein the rotor includes a twisted rod portion. 
     
     
       7. The pump of claim 5, wherein the bearing includes a plurality of ball bearings captured within a circular raceway. 
     
     
       8. The pump of claim 7, wherein the rotor is sealed to the pump casing by a rotatable seal. 
     
     
       9. A pump comprising: a motor;   a pump casing that houses a rotatable rotor assembly;   a rotatable housing surrounding at least a portion of the pump casing and operatively connected to the motor;   at least one first magnet located about an interior surface of the housing and rotatable therewithin;   at least one second magnet operatively connected to and rotatable with the rotor assembly;   a seal rotatable with the rotor assembly and in contact with the pump casing for isolating the at least one second magnet from material being pumped by the pump; and   a coolant inlet and outlet for cooling the pump.   
     
     
       10. The pump of claim 9, wherein the coolant inlet is coupled proximate a suction end of the pump to provide pumped material into a chamber housing the at least one second magnet and the coolant outlet is coupled proximate a discharge end of the pump ti egress pumped material from the chamber. 
     
     
       11. The pump of claim 9, wherein the coolant inlet is attached to a source of coolant exterior the pump to provide coolant into a chamber housing, the at least one second magnet and the coolant outlet being attached to drain coolant exterior the pump to egress coolant from the chamber. 
     
     
       12. A pump comprising: a motor;   a pump casing;   a first rotatable magnet operatively coupled to the motor and surrounding the pump casing;   a second rotatable magnet within the pump casing, the second rotatable magnet coupled to a rotor assembly, the rotor assembly including a rotor operatively coupled to a rotating member; and   a stator within the pump casing which is interposed between the rotor and the rotating member.   
     
     
       13. The pump of claim 12, wherein the stator includes an undulated progressive cavity. 
     
     
       14. The pump of claim 13, wherein the rotor is a twisted rod rotor. 
     
     
       15. The pump of claim 12, wherein the rotor assembly further includes an auger impeller housing operatively connected between the rotor and the rotating member, the auger impeller housing coupled to an auger.